Invention Grant
US07647192B2 Active removal of aliasing frequencies in a decimating structure by changing a decimation ratio in time and space
有权
通过在时间和空间上改变抽取比例，在抽取结构中主动去除混叠频率
- Patent Title: Active removal of aliasing frequencies in a decimating structure by changing a decimation ratio in time and space
- Patent Title (中): 通过在时间和空间上改变抽取比例，在抽取结构中主动去除混叠频率
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Application No.: US10924297Application Date: 2004-08-23
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Publication No.: US07647192B2Publication Date: 2010-01-12
- Inventor: Khurram Muhammad , Robert B. Staszewski , Gennady Feygin
- Applicant: Khurram Muhammad , Robert B. Staszewski , Gennady Feygin
- Applicant Address: US TX Dallas
- Assignee: Texas Instruments Incorporated
- Current Assignee: Texas Instruments Incorporated
- Current Assignee Address: US TX Dallas
- Agent Ronald O. Neerings; Wade James Brady, III; Frederick J. Telecky, Jr.
- Main IPC: G06F19/00
- IPC: G06F19/00
Abstract:
When a sample stream is decimated, frequency components from outside of a desired frequency band are aliased into the desired band, causing interference and loss of information. Different decimating ratios result in different frequencies aliasing into the desired frequency band. A current-mode sampling mixer 800 with capacitor banks 811 and 812 that are controlled by a digital control unit 820 with a capability to integrate and decimate an RF current at different decimating ratios is able to measure the frequency spectrum with different decimating ratios. The measured frequency spectrum is then analyzed to detect the presence of interferers aliased into the desired frequency band. The interferers can then be eliminated or avoided.
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